EP0446421A1 - Frein de véhicule pour chariot élévateur - Google Patents

Frein de véhicule pour chariot élévateur Download PDF

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Publication number
EP0446421A1
EP0446421A1 EP90121062A EP90121062A EP0446421A1 EP 0446421 A1 EP0446421 A1 EP 0446421A1 EP 90121062 A EP90121062 A EP 90121062A EP 90121062 A EP90121062 A EP 90121062A EP 0446421 A1 EP0446421 A1 EP 0446421A1
Authority
EP
European Patent Office
Prior art keywords
brake
spring
pressure medium
brake shoes
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90121062A
Other languages
German (de)
English (en)
Other versions
EP0446421B1 (fr
Inventor
Uwe Dipl.-Ing. John
Heinz Ing. Grad. Schalmath
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jungheinrich AG
Original Assignee
Jungheinrich AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19904008277 external-priority patent/DE4008277A1/de
Application filed by Jungheinrich AG filed Critical Jungheinrich AG
Publication of EP0446421A1 publication Critical patent/EP0446421A1/fr
Application granted granted Critical
Publication of EP0446421B1 publication Critical patent/EP0446421B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D59/00—Self-acting brakes, e.g. coming into operation at a predetermined speed
    • F16D59/02—Self-acting brakes, e.g. coming into operation at a predetermined speed spring-loaded and adapted to be released by mechanical, fluid, or electromagnetic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/18—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to vehicle weight or load, e.g. load distribution
    • B60T8/1812—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to vehicle weight or load, e.g. load distribution characterised by the means for pressure reduction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B5/00—Accessories or details specially adapted for hand carts
    • B62B5/04—Braking mechanisms; Locking devices against movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/07509—Braking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D49/00—Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like
    • F16D49/16—Brakes with two brake-blocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B5/00—Accessories or details specially adapted for hand carts
    • B62B5/04—Braking mechanisms; Locking devices against movement
    • B62B5/0452—Braking mechanisms; Locking devices against movement by hydraulic means

Definitions

  • the invention relates to a vehicle brake for a lift truck with at least one pressure-medium-operated lifting cylinder, which brake has brake shoes that can be pressed mechanically by means of a spring onto a brake disc, which can be released against the spring by spreading, whereby the braking's load dependence is caused by the pressure medium pressure in the lifting cylinder.
  • a spring abutment is adjusted by the introduction of the pressure from the lifting cylinder, so that the spring travel is changed at the same time.
  • the brake control arrangement provided for adjusting the spring abutment is arranged at the ends of the brake shoes on brake shoe approaches, on which the spring is also provided.
  • a fluid pressure acts indirectly as a function of the load on the lifting cylinder, because the braking force is not directly increased, but rather an increased braking force is indirectly brought about by the fact that the spring resistance offset from the brake shoe approaches to the outside ger is adjusted. This adjustment limits the effective travel. This limits the function of the spring.
  • the spring is preloaded at an increased load.
  • part of the spring force is consumed from the outset in the proposed embodiment and part of an adjustment path is excluded during operation. This also affects the working state, in which wear of the brake pads already consumes part of the spring force.
  • the invention has for its object to provide a vehicle brake according to the introductory remarks in connection with at least one pressure-operated lifting cylinder, in which a load-dependent brake force amplification is achieved without influencing the spring travel, so that the adjustment options of the brake are improved.
  • the tension of the spring is supported without restriction of its way in the sense of a brake application.
  • a spring considerable scope can also be created for the sensitivity of a brake application, but the invention then also ensures with certainty that a necessary brake application takes place with certainty and always great adaptability.
  • the specified solution is not only structurally relatively simple, but has the advantage that the dimension of the force amplification when applying the brakes can also be selected by dimensioning the extension lugs or the engagement bearings of the piston rods of the pistons arranged in the pressure medium cylinder.
  • a brake booster is provided in the same sense as the application pressure applied by the spring.
  • the compression spring is arranged next to the pressure medium cylinder. This results in a compact assembly in the preferred parallel arrangement of the spring and the brake force-boosting pressure medium cylinder.
  • the parallel arrangement of a pressure cylinder to the spring therefore represents an additional contact pressure, which in itself does not affect the arrangement of the spring.
  • a spring is arranged on a connecting pin between lugs on the brake shoes, between which the brake fan can also be used, the connecting pin penetrating the lugs and having abutments outside the lugs, one of which is a spring abutment on which the spring is supported.
  • the spring arrangement is expediently provided on one side of the brake shoes, specifically on lugs which spread when the brake is relieved.
  • an advantageous embodiment is that the spring, which is initially compressed and is in the compressed state for the purpose of releasing the drive, is provided after the brake shoe arrangement has been released, even with additional load-dependent brake force amplification, by means of a pressure medium cylinder to the full extent of its spring travel. Maintaining the full suspension travel has particularly favorable influences for adaptability for constant operating conditions. There is also no longer any need in the proposed design to use a reinforced spring which entails the risk of being dependent on vibrations.
  • Patent application P 38 33 571.9-21 explains how the parts introduced below with reference to drawings belong to a lifting vehicle.
  • a lifting vehicle has a chassis on which a lifting mast is arranged.
  • a load carrier slide 39 is guided in a vertically movable manner on this lifting mast.
  • Fork arms 40 are arranged on this carriage 39.
  • struts with load rollers are provided on the chassis, namely under fork arms. In their lowest position, these can be placed on the struts with a U-shaped profile that is open at the bottom.
  • a steerable drive wheel On the chassis of such a lifting vehicle, a steerable drive wheel is arranged in the middle between support trailing rollers.
  • a drive unit for the drive wheel is rotatably mounted in the chassis by means of a support and is connected via a linkage to a drawbar which also has a handle as a control head.
  • the brake disk 6 On the drive wheel.
  • the brake disk 6 can also be a brake drum.
  • two brake shoes 2, 3 with brake pads 4, 5 are arranged, which are pivotally mounted at one end about pins 7, 8, which are arranged in the chassis or on the drive unit.
  • the brake disc 6 possibly a brake drum, can be provided in a simple design in a three-wheeled vehicle. In a four-wheel vehicle or an arrangement on two coaxial wheels, two such arrangements are appropriate.
  • the brake shoes 2, 3 are pivotally mounted about pins 7, 8. It can be assumed that, according to FIGS. 1 and 2, the brake shoes 2, 3 have the protruding projections 9, 10 at the ends facing away from the ends pivotably supported by pins 7, 8.
  • a compression of the brake shoes can be counteracted by a brake fan, in particular an adjusting cam 17, which is arranged between the lugs 9, 10 of the brake shoes 2, 3 and is adjustable in the direction of the double arrow 18 shown. If this adjusting cam 17 is adjusted counterclockwise with respect to FIG. 1, the brake pads 4, 5 are lifted off, specifically with respect to FIG. 1 against the action of a pressure spring 19.
  • extension lugs 20, 21 are on the Side of the brake shoes 2, 3, which is turned away from the side with respect to the pins 7, 8 on which the lugs 9, 10 are provided with the cam 17.
  • the pressure spring 19 is located between these extension lugs 20, 21.
  • the cylinder 23 is connected via a connection 28 and a line 29 to a hydraulic control device 30 known per se. This is switched into a line section 42 with a pump 41, which is connected to a tank 43. At the same time, the control unit 30 is also connected to a return connection 31 to the tank.
  • a branched connecting line 33 opens into the line 29 and is connected to a pressure-dependent pressure chamber 34 of a lifting cylinder 1. It can be seen that a piston 35 of this lifting cylinder piston device is connected to a piston rod 36 which is guided upwards and on which a cable or chain 38 is guided via a deflection roller 37 and is connected to the load carrier slide 39 on which the fork arms 40 are arranged, which belong to the load carrier carriage on a lifting frame, not shown, as a load carrier.
  • Fig. 1 shows that the connection 33, 29 is always open.
  • the pump 41 which feeds the lifting cylinder piston device 1 acts both in the line 29 and in the connecting line 33.
  • the pressure connection in the manner described or a return connection in the tank 43 can be established by the control device 30.
  • the brake application is controlled, directly with the application of pressure by the pump 41, so that a direct intensification of the pressure application takes place.
  • This effect can be changed by adjusting the adjusting cam 17, for example in a vehicle by a pivoting movement of the drawbar 44 or in another embodiment of the vehicle by means of a linkage which is either confirmed by a driver or can also be carried out in the case of a driverless vehicle by entering a command on the route.
  • the spring 19 can apply its full force to apply the brake in any embodiment of the invention.
  • the extension of the spring can be inhibited only by adjusting the cam 17, the expansion capability of the cylinder piston arrangement then also being inhibited at the same time.
  • This connecting pin has a spring abutment 14 at one end at a distance from the outside of the extension 10.
  • a spring 15 is supported below this, the other end of which is supported on the extension 10, possibly via a washer. When released, this spring, a compression spring, applies the braking force to compress the brake shoes 2, 3.
  • the other end of the connecting pin 13 has a bottle 16 which rests on the outside of the extension 9.
  • the spring 15 strives to press the lugs 9, 10 together.
  • the cylinder piston assembly 22 is on the other side of the brake shoes than the spring with respect to the brake shoes arrangement. If the cylinder piston arrangement 22 is inserted between the extension lugs 20, 21, the spring 15 which promotes the brake application is located in FIG. 2 on a connecting pin 13 equipped with the bottle 16 and acts on the lug 10 from the outside.
  • the cylinder piston arrangement 22 acts in the same direction as the spring 15 for brake application, in particular increasing the brake application pressure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Braking Arrangements (AREA)
EP19900121062 1990-03-15 1990-11-02 Frein de véhicule pour chariot élévateur Expired - Lifetime EP0446421B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4008277 1990-03-15
DE19904008277 DE4008277A1 (de) 1988-10-03 1990-03-15 Fahrzeugbremse fuer hublader

Publications (2)

Publication Number Publication Date
EP0446421A1 true EP0446421A1 (fr) 1991-09-18
EP0446421B1 EP0446421B1 (fr) 1993-06-30

Family

ID=6402266

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900121062 Expired - Lifetime EP0446421B1 (fr) 1990-03-15 1990-11-02 Frein de véhicule pour chariot élévateur

Country Status (1)

Country Link
EP (1) EP0446421B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2293364A (en) * 1994-09-26 1996-03-27 Linde Ag Industrial Lift Truck
FR2755084A1 (fr) * 1996-10-25 1998-04-30 Warner France Dispositif de freinage a couple de freinage variable

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107311086B (zh) * 2016-04-26 2020-08-28 博世汽车柴油系统有限公司 判断叉车负载是否超重的控制单元和方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR390297A (fr) * 1908-05-15 1908-10-01 Abel Pifre Frein
GB433504A (en) * 1934-09-28 1935-08-15 Melbourne Dewhurst Improvements in electromagnetic and other brakes
US3080019A (en) * 1959-06-08 1963-03-05 Clark Equipment Co Industrial truck brake control system
US3896925A (en) * 1972-09-29 1975-07-29 Hitachi Ltd Braking system for an electrically-operated road such as an escalator
DE3833571A1 (de) * 1988-10-03 1990-04-05 Jungheinrich Kg Bremse fuer lastfahrzeuge, insbesondere hublader

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR390297A (fr) * 1908-05-15 1908-10-01 Abel Pifre Frein
GB433504A (en) * 1934-09-28 1935-08-15 Melbourne Dewhurst Improvements in electromagnetic and other brakes
US3080019A (en) * 1959-06-08 1963-03-05 Clark Equipment Co Industrial truck brake control system
US3896925A (en) * 1972-09-29 1975-07-29 Hitachi Ltd Braking system for an electrically-operated road such as an escalator
DE3833571A1 (de) * 1988-10-03 1990-04-05 Jungheinrich Kg Bremse fuer lastfahrzeuge, insbesondere hublader

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2293364A (en) * 1994-09-26 1996-03-27 Linde Ag Industrial Lift Truck
FR2724898A1 (fr) * 1994-09-26 1996-03-29 Linde Ag Chariot de manutention au sol equipe d'un frein a accumulation
GB2293364B (en) * 1994-09-26 1998-02-11 Linde Ag Industrial truck having an accumulator brake
FR2755084A1 (fr) * 1996-10-25 1998-04-30 Warner France Dispositif de freinage a couple de freinage variable
US6129184A (en) * 1996-10-25 2000-10-10 Dana Corporation Variable torque braking device
DE19747114B4 (de) * 1996-10-25 2005-05-25 Warner Françe Elektromagnetisch betätigte Scheibenbremse für Hublader

Also Published As

Publication number Publication date
EP0446421B1 (fr) 1993-06-30

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